Update glibc library version to 2.14 in CentOS6

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1、check glibc library in system.

strings /lib64/libc.so.6 |grep GLIBC_

So, we can see the newest version of glibc is 2.1.2, we need to upgrade glibc to 2.14.

2、download and install glibc-2.14

wget http://ftp.gnu.org/gnu/glibc/glibc-2.14.tar.gz

tar -xzvf glibc-2.14.tar.gz

cd glibc-2.14

mkdir build

cd build

../configure –prefix=/opt/glibc-2.14

make && make install

compiling and installing will take a long time.

3、create symbol link.

1、remove old symbol.

rm -rf /lib64/libc.so.6

2、rescue

LD_PRELOAD=/opt/glibc-2.14/lib/libc-2.14.so ln -s /opt/glibc-2.14/lib/libc-2.14.so /lib64/libc.so.6

becaue we can’t excute any command after the old symbol had been deleted，we must excute

the upper command carefully.

3、create new symbol link.

ln -s /opt/glibc-2.14/lib/libc-2.14.so /lib64/libc.so.6

4、check current glibc version.

side-effect and solution：

There is system time abnormal after updating glibc-2.12 to glibc-2.14.

the following.

Fri Feb 10 06:52:02 Local time zone must be set--see zic manual page 2019

Reason and solution:
GNU had stressed about TZ environment value. If there is no TZ value. system will chose 
defalut timezone,the specify address depends on library libc.so.6. the default timezone 
file path in centos is /etc/localtime before updating. But when we comire the new library，
set --prefix=/usr/local/glibc-2.14,this will lead to the default path changed to 
/usr/local/glibc-2.14/etc/localtime，So system can not find
the defalut timezone file path.

ln -sf /etc/localtime /usr/local/glibc-2.14/etc/localtime

reference url: https://segmentfault.com/q/1010000008312223
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